I came across this which answers my question: http://gadflyjl.org/guide_annotation.html
On Wednesday, December 10, 2014 at 8:05:02 AM UTC+11, Sheehan Olver wrote: > > > I want to add, say, a triangle or circle to a Gadfly plot. The following > works > > compose(render(plot(x=1:10,y=1:10)),circle(0.5,0.5,0.1)) > > But I want the circle to use the same coordinate system as the plot. Any > advice? > > >
